State-based random access resources for wireless communication

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive control information that indicates a first pool of random access (RACH) resources for UEs in a global navigation satellite system (GNSS)-available state and a second pool of RACH resources for UEs in a GNSS-less state. The second pool may include longer RACH preambles, longer RACH occasions, or a RACH preamble format associated with a greater quantity of propagation paths compared to the first pool. In response to the transitioning GNSS states during a RACH procedure, a UE may perform RACH failure operations, indicate the transition to a higher layer, get new RACH resources from a same or different pool, or any combination thereof. Additionally, or alternatively, the UE may indicate the transition, the different GNSS state, or both, to a non-terrestrial network entity in a RACH message of the RACH procedure or in dedicated signaling.

What is claimed is: 
     
         1 . A user equipment (UE), comprising:
 one or more memories storing processor-executable code;   a transceiver; and   one or more processors coupled with the one or more memories and the transceiver, the one or more processors individually or collectively operable to execute the code to cause the UE to:
 receive, via the transceiver, control information that indicates a first pool of random access resources for UEs in a first state with respect to a navigation satellite system and a second pool of random access resources for UEs in a second state with respect to the navigation satellite system, wherein at least one random access resource in the first pool of random access resources is not included in the second pool of random access resources or at least one random access resource in the second pool of random access resources is not included in the first pool of random access resources; and 
 transmit, via the transceiver, a first random access message using a first random access resource, wherein whether the first random access resource is from the first pool of random access resources or the second pool of random access resources is based at least in part on a state of the UE with respect to the navigation satellite system. 
   
     
     
         2 . The UE of  claim 1 , wherein:
 random access resources in the first pool of random access resources are in accordance with a first set of parameter values and random access resources in the second pool of random access resources are in accordance with a second set of parameter values, wherein the first set of parameter values and the second set of parameter values share a common set of parameter values,   to indicate the random access resources in the first pool, the control information indicates each of the first set of parameter values including the common set of parameter values, and   to indicate the random access resources in the second pool, the control information indicates each of the second set of parameter values excluding the common set of parameter values.   
     
     
         3 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 transmit, via the transceiver, a second random access message using a second random access resource from a different pool of random access resources, wherein whether the different pool of random access resources is the first pool of random access resources or the second pool of random access resources is based at least in part on whether the UE has transitioned, during or after transmission of the first random access message, from the first state to the second state or from the second state to the first state.   
     
     
         4 . The UE of  claim 3 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 reset a random access transmission counter based at least in part on the second random access resource being from the different pool of random access resources than the first random access resource.   
     
     
         5 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 perform one or more random access failure operations based at least in part on a transition of the UE, during or after transmission of the first random access message, to a different state of the UE with respect to the navigation satellite system.   
     
     
         6 . The UE of  claim 5 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 indicate the transition of the UE to the different state as a cause of random access failure to an upper layer of the UE based at least in part on performing the one or more random access failure operations.   
     
     
         7 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 transmit, via the transceiver, a second random access message using a second random access resource, wherein the second random access resource and the first random access resource are from a same pool of random access resources despite a transition of the UE, during or after transmission of the first random access message, to a different state of the UE with respect to the navigation satellite system.   
     
     
         8 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 receive, via the transceiver and in response to the first random access message, a random access response message indicating information associated with an uplink frequency adjustment for a third random access message.   
     
     
         9 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 receive, via the transceiver and in response to the first random access message, a random access response message; and   transmit, via the transceiver and in response to the random access response message, a third random access message that indicates a transition of the UE to a different state of the UE with respect to the navigation satellite system, the different state, or both.   
     
     
         10 . The UE of  claim 1 , wherein the one or more processors are individually or collectively further operable to execute the code to cause the UE to:
 enter a connected mode based at least in part on transmitting the first random access message; and   transmit, via the transceiver and after entering the connected mode, an indication of a transition of the UE, during or after transmission of the first random access message, to a different state of the UE with respect to the navigation satellite system, the different state, or both.   
     
     
         11 . A method for wireless communications at a user equipment (UE), comprising:
 receiving control information that indicates a first pool of random access resources for UEs in a first state with respect to a navigation satellite system and a second pool of random access resources for UEs in a second state with respect to the navigation satellite system; and   transmitting a first random access message using a first random access resource, wherein whether the first random access resource is from the first pool of random access resources or the second pool of random access resources is based at least in part on a state of the UE with respect to the navigation satellite system.   
     
     
         12 . The UE of  claim 11 , wherein:
 random access resources in the first pool of random access resources are in accordance with a first set of parameter values and random access resources in the second pool of random access resources are in accordance with a second set of parameter values, wherein the first set of parameter values and the second set of parameter values share a common set of parameter values,   to indicate the random access resources in the first pool, the control information indicates each of the first set of parameter values including the common set of parameter values, and   to indicate the random access resources in the second pool, the control information indicates each of the second set of parameter values excluding the common set of parameter values.   
     
     
         13 . The method of  claim 11 , wherein the first random access resource is from the second pool of random access resources based at least in part on:
 the state of the UE with respect to the navigation satellite system comprising the UE being unable to obtain its location using the navigation satellite system,   the UE being incapable of using the navigation satellite system,   an expiration of a navigation satellite system validity timer,   a resource selection probability factor indicated in the control information, or   any combination thereof.   
     
     
         14 . The method of  claim 11 , wherein the second pool of random access resources comprises longer random access preambles than the first pool of random access resources, longer random access occasions than the first pool of random access resources, random access preambles having a format associated with a greater quantity of propagation paths than the first pool of random access resources, or any combination thereof. 
     
     
         15 . The method of  claim 11 , wherein, based at least in part on the first random access resource being from the second pool of random access resources, a timing advance, frequency adjustment, or any combination thereof associated with the first random access message is based at least in part on:
 a common timing advance for UEs in the second state,   a common frequency adjustment for UEs in the second state,   one or more derivatives of the common timing advance,   one or more derivatives of the common frequency adjustment,   a validity duration associated with the common timing advance or the common frequency adjustment,   a reference location for UEs in the second state,   a location drift associated with the reference location,   a location drift rate associated with the reference location,   a validity duration associated with the reference location,   one or more timing advance commands or frequency adjustment commands received by the UE within a duration of time or stored in a buffer at the UE, or   any combination thereof.   
     
     
         16 . The method of  claim 11 , wherein the first random access resource is from the first pool of random access resources based at least in part on the state of the UE being the first state, the method further comprising:
 transmitting, based at least in part on failing to receive a random access response message in response to the first random access message, a third random access message using a second random access resource from the second pool of random access resources despite being in the first state.   
     
     
         17 . The method of  claim 16 , further comprising:
 applying a timing advance, a frequency adjustment, or both, to the third random access message based at least in part on measurements of one or more signals from the navigation satellite system.   
     
     
         18 . The method of  claim 11 , wherein the control information comprises a flag indicating whether a cell associated with the control information supports random access procedures for UEs in the second state with respect to the navigation satellite system. 
     
     
         19 . The method of  claim 11 , wherein:
 the first state with respect to the navigation satellite system comprises the UE being able to obtain its location using the navigation satellite system, being capable of using the navigation satellite system, or both, and   the second state with respect to the navigation satellite system comprises the UE being unable to obtain its location using the navigation satellite system, being incapable of using the navigation satellite system, or both.   
     
     
         20 . A non-transitory computer-readable medium storing code for wireless communications, the code comprising instructions executable by one or more processors to:
 receive control information that indicates a first pool of random access resources for UEs in a first state with respect to a navigation satellite system and a second pool of random access resources for UEs in a second state with respect to the navigation satellite system; and   transmit a first random access message using a first random access resource, wherein whether the first random access resource is from the first pool of random access resources or the second pool of random access resources is based at least in part on a state of a UE with respect to the navigation satellite system.